What if the protagonist was Charlize Theron?
I'm not sure how that would work out since I haven't read the book and know nothing about it. (I do know that I like Charlize Theron.)
according to Trackboard :
"The story centers around American operative Court Gentry, also known as ‘The Gray Man’. Gentry has become a legend in the covert realm for his ability to accomplish the impossible before fading into the ether. Now, Gentry is in a race against time to save his daughters from a team of government assassins determined to eliminate them. "